1. Medical Research Council (MRC) Laboratory for Molecular Cell Biology,
2. MRC Cell Biology Unit, and
3. Department of Cell and Developmental Biology, University College London (UCL), London, United Kingdom;
4. Department of Cardiovascular Science, Faculty of Medicine, Dentistry and Health, The University of Sheffield, Sheffield, United Kingdom; and
5. Biochemisches Institut, Christian-Albrechts-Universität Kiel, Kiel, Germany